Stock inlet for paper machines



Sept. 16, 1930.

R. T. LANG l ,77 5,905

STOCK INLET FOR PAPER MACHINES Filed March 20, 1928 IN V EN TOR. Panza d715a BY/CifW ATTORNEZJ Patented Sept. 16, 1 930 UNITED STATES PATENTOFFICE RICHARD T. LANG, OF WEEHAWKEN, NEW JERSEY, ASSIGNOR TO AMERICANVOITH CONTACT CO., INC., OF NEW YORK, N. Y.,' A. CORPORATION OF NEW YORKSTOCK INLET FOR PAPER MACHINES Application filed March 20, 1928. SerialNo. 263,033.

This invention relates to improvements in stock inlets for papermachines and has for its purpose to adapt the so-called Voith stockinlet to the" requirements of slow running itself.

roll for the uniform distribution of the stock over the width of thewire, this roll is so located in the inlet box that its lowest point isnear the bottom of the inlet box or about at the same level with thewire so that the roll extends its full diameter over said level of thewire. For reasons of design the roll has a diameter of at least 5" andit has to be fully submerged in the stock, as otherwise lumps etc. wouldbe formed which, when getting loose from the roll, would be delivered tothe wire and would cause breaks of the web at the couch press and thewet presses. For a successful operation of the inlet a head of at least5 has therefore to be maintained in the inlet box, which would produce aspeed of the stock of about 300 ft.-per minute at its outlet gate. Heavysheets and fine rag paper are manufactured with working speeds of from20-100 ft. per minute only. For this class i of paper a speed of thestock of300 ft. would produce an extremely bad and cloudy formation ofthe web even on a wire running uphill to some extent. r

The standard design of the stock inlet with the distributing rolllocated at the bottom of the inlet box, therefore, cannot besuccessfully used for low speed pa er machines. The disadvantagesdescribed efore can be eliminated, however, and the good features of thestock inlet can be fully utilized for low speed paper machines also.when designing the stock inlet in accordance with the present invention.

The new inventive thought is to locate the distributing roll in a recessin the bottom of the inlet box in such a manner that its vertex does notmaterially project beyond the bottom of the box. A bafiie board isprovided on top of the roll, which can be set more or less close to theroll. This board divides the inlet box into 2 compartments with the rollforming the perforated partition for letting the stock pass from onecompartment into the other. Such an arrangement allows to maintain ahead in the backward compartment of the inlet boxi. e. the compartmenton the side of the screenshigh enough to make the stock fully cover theperforated roll and force it through the latter, which acts like athrottle reducing the head of the stock in the forward compartment ofthe box-i. e. the compartment on the side of the breast rollto such anextent that the speed of the stock leaving the inlet box is consonant tothe speed of the wire proper. It is essential that the distributing rollbe located as close as possible to the outlet gate of the inlet box sothat no undercurrents or the like can be produced when thestock flowsfrom the rolls to the outlet gate, as otherwise streaks ora wildformation of the web would be the result.

I have shown an application of my invention in the accompanying drawingwhich represents a vertical cross-section through the stock inlet andthe breast roll end of the wire.

In this drawing A is the inlet box, B is the distributing roll which islocated in a recess C in the inlet box A. D is the baflie board on topof the roll which divides the inlet box into a forward and backwardcompartment. The bafile board can be made adjustable by means of spindleE and handwheel F so as to enable its more or less close setting to theroll. G is the breast roll over which the wire H is running. I is theoutlet gate on the inlet box A through which the stock is delivered onto the wire H. Means K, L, M are provided for making the gate adjustablein order to vary the height of the opening of the outlet gate throughwhich the stock flows on the wire H, thereb controlling the quantity ofstock delivere upon same. The gate I is made of flexible material andmeans N, O and P are provided for warping it more or less at differentpoints-across the width of the wire for urpose of obtaining an even anduniform ow of the stock on to the wire over its entire width. The headof the stock in. the backward compartment is shown on level Q, whereasin the forward compartment it is shown on level R corresponding with thelevel S of the head of the stock over the wire.

The end of the stock inlet box is shown at T and this end terminatesabove the bottom in proximity to the baflle plate D and distributingroll B. The outlet gate I is movably attached as by hinging or otherwisealoing one edge to the lower edge of this en The drawing shows oneapplication of the inventive idea only. It is to be understood, however,that different arrangements and locations of the individual parts may behad without departing from .the spirit of my invention.

I claim as my invention! 1. In a paper machine, a stock box having oneend shaped to provide an outlet opening, an outlet gate in said opening,the bottom of said box being povided with a transverse recess adjacentsaid opening, a perforated roll in said 'recess, and a baflle platesupported'by the box adjacent the end above said roll. I a

2. In a paper machine, a stock inlet box having one end shaped toprovide an outlet opening, a gate to control said opening, the

' bottom of the box adjacent said opening having a transverse recesstherein, a perforated roll in said recess, a baflle plate extendingacross the box above said roll and adjacent said end, and means foradjusting said baflle plate towards and from the roll,

3. In a paper machine, astdck inlet box having one end shaped to providean outlet opening, a gate associated with said end to control saidopening, a bafile plate arranged transversely of the box and extendingnto the path of approach to said outlet opening, and a perforatedrollrrange'd transversely of the box below said ba' e plate.

In testimony that I claim the foregoing as my invention, and have signedmy name hereto.

RICHARD T. LANG.

